<template>
  <div class="detail">
    <Header/>
    <div class="main">
      <div class="course-info">
        <div class="wrap-left">
          <videoPlayer class="video-player vjs-custom-skin"
                       ref="videoPlayer"
                       :playsinline="true"
                       :options="playerOptions"
                       @play="onPlayerPlay($event)"
                       @pause="onPlayerPause($event)"></videoPlayer>
        </div>
        <div class="wrap-right">
          <h3 class="course-name">{{course.name}}</h3>
          <p class="data">{{course.students}}人在学&nbsp;&nbsp;&nbsp;&nbsp;课程总时长：{{course.lessons}}课时/{{course.lessons==course.pub_lessons?"更新完成":`已更新${course.pub_lessons}课时`}}&nbsp;&nbsp;&nbsp;&nbsp;难度：{{course.level_name}}</p>
          <div class="sale-time" v-if="course.has_time > 0">
            <p class="sale-type" v-if="course.has_time > 0">{{course.discount_name}}</p>
            <p class="sale-type" v-else>¥{{course.price}}</p>
            <p class="expire" v-if="course.has_time>0">距离结束：仅剩 {{parseInt( course.has_time/(24*60*60) ) | time_format}}天
              {{parseInt(course.has_time/3600%24) | time_format}}小时 {{parseInt(course.has_time/60%60) | time_format}}分
              <span class="second">{{parseInt(course.has_time%60) | time_format}}</span> 秒</p>
          </div>
          <p class="course-price">
            <span v-if="course.discount_name">活动价</span>
            <span class="discount" v-if="course.discount_name">¥{{course.discount_price}}</span>
            <span class="discount" v-else>¥{{course.price}}</span>
            <span class="original" v-if="course.discount_name">¥{{course.price}}</span>
          </p>
          <div class="buy">
            <div class="buy-btn">
              <button class="buy-now">立即购买</button>
              <button class="free">免费试学</button>
            </div>
            <div class="add-cart" @click="add_cart"><img src="/static/image/cart-yellow.svg"> 加入购物车</div>
          </div>
        </div>
      </div>
      <div class="course-tab">
        <ul class="tab-list">
          <li :class="tabIndex==1?'active':''" @click="tabIndex=1">详情介绍</li>
          <li :class="tabIndex==2?'active':''" @click="tabIndex=2">课程章节 <span :class="tabIndex!=2?'free':''">(试学)</span>
          </li>
          <li :class="tabIndex==3?'active':''" @click="tabIndex=3">用户评论 (42)</li>
          <li :class="tabIndex==4?'active':''" @click="tabIndex=4">常见问题</li>
        </ul>
      </div>
      <div class="course-content">
        <div class="course-tab-list">
          <div class="tab-item" v-if="tabIndex==1">
            <div v-html="course.brief"></div>
          </div>
          <div class="tab-item" v-if="tabIndex==2">
            <div class="tab-item-title">
              <p class="chapter">课程章节</p>
              <p class="chapter-length">共{{chapter_list.length}}章{{course.lessons}}个课时</p>
            </div>
            <div class="chapter-item" v-for="chapter,key in chapter_list" :key="key">
              <p class="chapter-title"><img src="/static/image/1.svg" alt="">第{{chapter.chapter}}章·{{chapter.name}}</p>
              <ul class="lesson-list">
                <li class="lesson-item" v-for="lesson in chapter.lesson_data" :key="key">
                  <p class="name"><span class="index">{{chapter.chapter}}-{{lesson.lesson}}</span> 课程介绍-学习流程<span
                    class="free" v-if="lesson.free_trail">免费</span></p>
                  <p class="time">{{lesson.duration}} <img src="/static/image/chapter-player.svg"></p>
                  <button class="try" v-if="lesson.free_trail">立即试学</button>
                  <button class="try" v-else>立即购买</button>
                </li>

              </ul>
            </div>
          </div>
          <div class="tab-item" v-if="tabIndex==3">
            用户评论
          </div>
          <div class="tab-item" v-if="tabIndex==4">
            常见问题
          </div>
        </div>
        <div class="course-side">
          <div class="teacher-info">
            <h4 class="side-title"><span>{{course.teacher.name}}</span></h4>
            <div class="teacher-content">
              <div class="cont1">
                <img :src="course.teacher.image">
                <div class="name">
                  <p class="teacher-name">{{course.teacher.name}}</p>
                  <p class="teacher-title">{{course.teacher.siganture }} {{course.teacher.title}}</p>
                </div>
              </div>
              <p class="narrative">{{course.teacher.brief}}</p>
            </div>
          </div>
        </div>
      </div>
    </div>
    <Footer/>
  </div>
</template>

<script>
  import Header from "./common/Header"
  import Footer from "./common/Footer"
  // 1.加载播放器组件
  import {videoPlayer} from 'vue-video-player';

  export default {
    name: "Detail",
    data() {
      return {
        tabIndex: 2, // 当前选项卡显示的下标
        course_id: "",  // 当前课程ID
        chapter_list: [],     // 章节信息列表
        course: {         // 课程信息
          teacher: {}
        },
        playerOptions: {
          playbackRates: [0.7, 1.0, 1.5, 2.0], // 播放速度
          autoplay: false, //如果true,则自动播放
          muted: false, // 默认情况下将会消除任何音频。
          loop: false, // 循环播放
          preload: 'auto',  // 建议浏览器在<video>加载元素后是否应该开始下载视频数据。auto浏览器选择最佳行为,立即开始加载视频（如果浏览器支持）
          language: 'zh-CN',
          aspectRatio: '16:9', // 将播放器置于流畅模式，并在计算播放器的动态大小时使用该值。值应该代表一个比例 - 用冒号分隔的两个数字（例如"16:9"或"4:3"）
          fluid: true, // 当true时，Video.js player将拥有流体大小。换句话说，它将按比例缩放以适应其容器。
          sources: [{ // 播放资源和资源格式
            type: "video/mp4",
            src: "//player.alicdn.com/video/editor.mp4" //视频地址（必填）
          }],
          poster: "", //视频封面图
          width: document.documentElement.clientWidth, // 默认视频全屏时的最大宽度
          notSupportedMessage: '此视频暂无法播放，请稍后再试', //允许覆盖Video.js无法播放媒体源时显示的默认信息。
        }
      }
    },
    filters: {
      time_format(time) {
        if (time < 10) {
          return '0' + time
        } else {
          return time
        }
      }
    },

    methods: {
      add_cart() {
        // 验证用户是否登录
        let token = this.$settings.token();
        if (!token) {
          this.$confirm('尚未登录,请登录后在进行该操作', '路飞学城', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(() => {
            this.$router.push('/login')
          }).catch(() => {
          });
          return false
        }

        this.$axios.post(`${this.$settings.Host}/cart/`, {
          course_id: this.course_id
        }, {
          headers: {
            Authorization: "jwt " + token
          }
        }).then(response => {
          this.$message.success("加入购物车成功")
        }).catch(error => {
          this.$message.error("加入购物车失败！")
        })

      },
      onPlayerPlay() {
        this.$message.success("开始播放...")
      },
      onPlayerPause() {
        this.$message.success("暂停播放...")
      },
      get_course_retrieve() {

        let self = this
        if (this.course_id < 1) {
          this.$alert("对不起，获取的课程不存在", '路飞学诚', {
            callback() {
              self.$router.push('/')
            }
          })

        }
        // 获取课程详情数据
        this.$axios.get(`${this.$settings.Host}/course/${this.course_id}/`).then(response => {
          this.course = response.data;
          let data = response.data.brief;
          let str = `src="/media`;
          while (data.search(str) != "-1") {
            data = data.replace(str, `src="${this.$settings.Host}/media`)
          }
          this.course.brief = data
          // 替换播放器中的封面图和视频
          this.playerOptions.sources[0].src = response.data.course_video;
          this.playerOptions.poster = response.data.course_img;

          let t = setInterval(()=>{
            if ( this.course.has_time > 1){
              this.course.has_time -= 1
            }else{
              //活动结束
              this.course.has_time = 0;
              this.course.discount_name = "";
              this.course.discount_price = -1;
              clearInterval(t);
            }
          },1000)
        }).catch(error => {
          this.$message.error("获取课程详情信息失败！")
        })
      }
      ,
      get_chapter() {
        this.$axios.get(`${this.$settings.Host}/course/chapter/`, {
          params: {
            "course": this.course_id
          }
        }).then(response => {
          this.chapter_list = response.data
        }).catch(error => {
          this.$message.error("获取章节信息失败！")
        })

      }
      ,
    }
    ,
    created() {
      // 获取地址栏中的参数
      this.course_id = this.$route.params.course;
      // 请求后端的数据
      this.get_course_retrieve();
      this.get_chapter();

    }
    ,
    components: {
      Header,
      Footer,
      videoPlayer,
    },
  }
</script>

<style scoped>
  .main {
    background: #fff;
    padding-top: 30px;
  }

  .course-info {
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
  }

  .wrap-left {
    float: left;
    width: 690px;
    height: 388px;
    background-color: #000;
  }

  .wrap-right {
    float: left;
    position: relative;
    height: 388px;
  }

  .course-name {
    font-size: 20px;
    color: #333;
    padding: 10px 23px;
    letter-spacing: .45px;
  }

  .data {
    padding-left: 23px;
    padding-right: 23px;
    padding-bottom: 16px;
    font-size: 14px;
    color: #9b9b9b;
  }

  .sale-time {
    width: 464px;
    background: #fa6240;
    font-size: 14px;
    color: #4a4a4a;
    padding: 10px 23px;
    overflow: hidden;
  }

  .sale-type {
    font-size: 16px;
    color: #fff;
    letter-spacing: .36px;
    float: left;
  }

  .sale-time .expire {
    font-size: 14px;
    color: #fff;
    float: right;
  }

  .sale-time .expire .second {
    width: 24px;
    display: inline-block;
    background: #fafafa;
    color: #5e5e5e;
    padding: 6px 0;
    text-align: center;
  }

  .course-price {
    background: #fff;
    font-size: 14px;
    color: #4a4a4a;
    padding: 5px 23px;
  }

  .discount {
    font-size: 26px;
    color: #fa6240;
    margin-left: 10px;
    display: inline-block;
    margin-bottom: -5px;
  }

  .original {
    font-size: 14px;
    color: #9b9b9b;
    margin-left: 10px;
    text-decoration: line-through;
  }

  .buy {
    width: 464px;
    padding: 0px 23px;
    position: absolute;
    left: 0;
    bottom: 20px;
    overflow: hidden;
  }

  .buy .buy-btn {
    float: left;
  }

  .buy .buy-now {
    width: 125px;
    height: 40px;
    border: 0;
    background: #ffc210;
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
    margin-right: 15px;
    outline: none;
  }

  .buy .free {
    width: 125px;
    height: 40px;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 15px;
    background: #fff;
    color: #ffc210;
    border: 1px solid #ffc210;
  }

  .add-cart {
    float: right;
    font-size: 14px;
    color: #ffc210;
    text-align: center;
    cursor: pointer;
    margin-top: 10px;
  }

  .add-cart img {
    width: 20px;
    height: 18px;
    margin-right: 7px;
    vertical-align: middle;
  }

  .course-tab {
    width: 100%;
    background: #fff;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px 0 #f0f0f0;

  }

  .course-tab .tab-list {
    width: 1200px;
    margin: auto;
    color: #4a4a4a;
    overflow: hidden;
  }

  .tab-list li {
    float: left;
    margin-right: 15px;
    padding: 26px 20px 16px;
    font-size: 17px;
    cursor: pointer;
  }

  .tab-list .active {
    color: #ffc210;
    border-bottom: 2px solid #ffc210;
  }

  .tab-list .free {
    color: #fb7c55;
  }

  .course-content {
    width: 1200px;
    margin: 0 auto;
    background: #FAFAFA;
    overflow: hidden;
    padding-bottom: 40px;
  }

  .course-tab-list {
    width: 880px;
    height: auto;
    padding: 20px;
    background: #fff;
    float: left;
    box-sizing: border-box;
    overflow: hidden;
    position: relative;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }

  .tab-item {
    width: 880px;
    background: #fff;
    padding-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }

  .tab-item-title {
    justify-content: space-between;
    padding: 25px 20px 11px;
    border-radius: 4px;
    margin-bottom: 20px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51, 51, 51, .05);
    overflow: hidden;
  }

  .chapter {
    font-size: 17px;
    color: #4a4a4a;
    float: left;
  }

  .chapter-length {
    float: right;
    font-size: 14px;
    color: #9b9b9b;
    letter-spacing: .19px;
  }

  .chapter-title {
    font-size: 16px;
    color: #4a4a4a;
    letter-spacing: .26px;
    padding: 12px;
    background: #eee;
    border-radius: 2px;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
  }

  .chapter-title img {
    width: 18px;
    height: 18px;
    margin-right: 7px;
    vertical-align: middle;
  }

  .lesson-list {
    padding: 0 20px;
  }

  .lesson-list .lesson-item {
    padding: 15px 20px 15px 36px;
    cursor: pointer;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
  }

  .lesson-item .name {
    font-size: 14px;
    color: #666;
    float: left;
  }

  .lesson-item .index {
    margin-right: 5px;
  }

  .lesson-item .free {
    font-size: 12px;
    color: #fff;
    letter-spacing: .19px;
    background: #ffc210;
    border-radius: 100px;
    padding: 1px 9px;
    margin-left: 10px;
  }

  .lesson-item .time {
    font-size: 14px;
    color: #666;
    letter-spacing: .23px;
    opacity: 1;
    transition: all .15s ease-in-out;
    float: right;
  }

  .lesson-item .time img {
    width: 18px;
    height: 18px;
    margin-left: 15px;
    vertical-align: text-bottom;
  }

  .lesson-item .try {
    width: 86px;
    height: 28px;
    background: #ffc210;
    border-radius: 4px;
    font-size: 14px;
    color: #fff;
    position: absolute;
    right: 20px;
    top: 10px;
    opacity: 0;
    transition: all .2s ease-in-out;
    cursor: pointer;
    outline: none;
    border: none;
  }

  .lesson-item:hover {
    background: #fcf7ef;
    box-shadow: 0 0 0 0 #f3f3f3;
  }

  .lesson-item:hover .name {
    color: #333;
  }

  .lesson-item:hover .try {
    opacity: 1;
  }

  .course-side {
    width: 300px;
    height: auto;
    margin-left: 20px;
    float: right;
  }

  .teacher-info {
    background: #fff;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }

  .side-title {
    font-weight: normal;
    font-size: 17px;
    color: #4a4a4a;
    padding: 18px 14px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51, 51, 51, .05);
  }

  .side-title span {
    display: inline-block;
    border-left: 2px solid #ffc210;
    padding-left: 12px;
  }

  .teacher-content {
    padding: 30px 20px;
    box-sizing: border-box;
  }

  .teacher-content .cont1 {
    margin-bottom: 12px;
    overflow: hidden;
  }

  .teacher-content .cont1 img {
    width: 54px;
    height: 54px;
    margin-right: 12px;
    float: left;
  }

  .teacher-content .cont1 .name {
    float: right;
  }

  .teacher-content .cont1 .teacher-name {
    width: 188px;
    font-size: 16px;
    color: #4a4a4a;
    padding-bottom: 4px;
  }

  .teacher-content .cont1 .teacher-title {
    width: 188px;
    font-size: 13px;
    color: #9b9b9b;
    white-space: nowrap;
  }

  .teacher-content .narrative {
    font-size: 14px;
    color: #666;
    line-height: 24px;
  }
</style>
